<template>
  <div class="upload-file">
    <el-upload
      ref="upload"
      :auto-upload="true"
      :limit="limit"
      :headers="upload.headers"
      :action="upload.url"
      :data="upload.data"
      :disabled="upload.isUploading || disabled"
      :on-change="handleFileChange"
      :before-upload="handleBeforeUpload"
      :on-progress="handleFileUploadProgress"
      :on-success="handleFileSuccess"
      :on-error="handleUploadError"
      :file-list="fileList"
      :on-exceed="handleExceed"
      class="upload-file-uploader"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">选取文件</el-button>
      <!-- 上传提示 -->
      <div v-if="showTip" slot="tip" class="el-upload__tip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的图片{{ isShowVideoTips ? '，或500M以内的视频。':'。' }}
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        v-for="(file, index) in fileList"
        :key="file.url"
        class="el-upload-list__item ele-upload-list__item-content"
      >
        <el-link :href="`${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link
            :underline="false"
            type="danger"
            @click="handleDelete(index)"
          >删除</el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth'

export default {
  name: 'FileUpload',
  props: {
    // 值
    // eslint-disable-next-line vue/require-default-prop
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 10
    },
    isShowVideoTips: {
      type: Boolean,
      default: true
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 1.5
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    // 媒体类型限制
    onlyVideo: {
      type: Boolean,
      default: false
    },
    disabled: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      fileList: [],
      // 用户导入参数
      upload: {
        title: '', // 弹出层标题
        isUploading: false, // 是否禁用上传
        url: `${process.env.VUE_APP_BASE_API + (process.env.NODE_ENV === 'development' ? 'admin-api-test/' : 'admin-api/')}infra/file/upload`, // 请求地址
        headers: { Authorization: 'Bearer ' + getToken() }, // 设置上传的请求头部
        data: {} // 上传的额外数据
      },
      fileType: ['png', 'jpg', 'jpeg']
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          let temp = 1
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',')
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === 'string') {
              item = { name: item, url: item }
            }
            item.uid = item.uid || new Date().getTime() + temp++
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  methods: {
    /** 处理上传的文件发生变化 */
    handleFileChange(file, fileList) {
      this.upload.data.path = file.name
    },
    /** 处理文件上传中 */
    handleFileUploadProgress(event, file, fileList) {
      this.upload.isUploading = true // 禁止修改
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      if (this.onlyVideo && file.type.indexOf('video') === -1) {
        this.$modal.msgError('请上传视频文件')
        return false
      }
      if (
        file.type.indexOf('image') === -1 &&
        file.type.indexOf('video') === -1
      ) {
        this.$modal.msgError('请上传图片、视频文件')
        return false
      }
      let isImg = false
      let isVideo = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }
      isVideo = file.type.indexOf('video') > -1
      if (isImg && this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      if (isVideo) {
        // 限制500M
        const isLt = file.size / 1024 / 1024 < 500
        if (!isLt) {
          this.$modal.msgError(`上传视频大小不能超过500MB!`)
          return false
        }
      }
      this.$modal.loading('正在上传，请稍候...')
      this.number++
      return true
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError('上传图片失败，请重试')
      this.$modal.closeLoading()
    },
    // 上传成功回调
    handleFileSuccess(res, file) {
      this.$refs.upload.clearFiles()
      // 清理
      this.upload.isUploading = false
      this.$modal.closeLoading()
      // 如果上传成功
      if (res.code === 0) {
        this.uploadList.push({ name: file.name, url: res.data })
        if (this.uploadList.length === this.number) {
          this.fileList = this.fileList.concat(this.uploadList)
          this.uploadList = []
          this.number = 0
          this.$emit('input', this.listToString(this.fileList))
        }
      } else {
        this.$modal.msgError(res.msg)
      }
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1)
      this.$emit('input', this.listToString(this.fileList))
    },
    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf('/') > -1) {
        return name.slice(name.lastIndexOf('/') + 1)
      } else {
        return ''
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = ''
      separator = separator || ','
      for (const i in list) {
        strs += list[i].url + separator
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : ''
    }
  }
}
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
